Casing for a firearm ammunition magazine



FIG. 1 is a first side view of a casing for a firearm ammunition magazine showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a second side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a perspective view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a top view thereof. 

CLAIM The ornamental design for a casing for a firearm ammunition magazine, as shown and described. 